I have Rusty's 4.5" kit, which on my truck gave about 6"!!
This was the good thing. The bad thing is that the rear springs were not what I was expecting them to be.
In short:
1. The springs were too short and too stiff. As a result, they left the shackles inclined to the fully forward position, almost touching their mounts. Needless to say, that didn't provide much articulation.
2. Due -most probably- to the shackles problem, the springs binded and therefore cause the front ends to move around their bushings, enough to touch the right side of the front mounts.
3. The ride was extremely harsh, enough to cause your kidneys to move up and down when crossing a speed bump.
4. The friction pads at their ends are a joke. At least two of them have broken their studs, and have slipped away. The one on the right leaf pack moved towards the exhaust and melted, a funny smell was following me.
5. I have to admit that Rusty has send me some .75" extended, greasable shackles, trying to solve the problem, as well as new (different design) front bushings. The new shackles had the wrong grease nipple (straight, instead of bent, makes things too difficult when greasing them). And of course, I had to pay twice for the same work, just because of the quality of Rusty's springs.
Pictures of all these, at the Cherokee link in signature.
What I finally did, was to remove the lower leaf of the pack and install the new bushings and shackles. That gave me a softer ride, with almost the same lift as before (close to 6").
Overall, I am not impressed with the quality of these springs, although I am pretty satisfied with my current setup. But with the money I had to pay for double labor, I could have got the RE springs from the beginning.